v0.10.0

Features

• add abbr plugin (45fdfcb)
• add insert plugin (fcf0fa7)
• add katex-slim and mathjax-slim package (a766226)
• add ruby plugin (9f9b70a)
• add spoiler plugin (1b2e7b9)
• add style export (a37f92c)
• demo: add contentRender option (349440b)